int count=10;
main()//唐子豪
{
    int n;
    printf("Enter a number:");
    scanf("%d",&n);
    vr6174(n);

}
vr6174(num)
    int num;
{
    int each[4],max,min;
    if(num!=6174&&num){
        parse_sort(num,each);
        max_min(each,&max,&min);
        num=max_min;
        printf("[%d]:%d-%d=%d\n",++count,max,min,num);
        vr6174(num);
    }
}
parse_sort(num,each)
    int num,*each;
    {
        int i,*j,*k,temp;
        for(i=0;i<=4;i++){
            j=each+3-i;
            *j=num%10;
            num/=10;
        }
        for(i=0;i<3;i++)
            for(j=each,k=each+1;j<each+3-i;j++,k++)
            if(*j>*k){temp=*j; *j=*k;*k=temp;}
        return;
    }
max_min(each,max,min)
    int *each,*max,*min;
    {
        int *i;
        *min=0;
        for(i=each;i<each+4;i++)
            *min=*min*10+*i;
        *max=0;
        for(i=each+3;i>=each;i--)
            *max=*max*10+*i;
        return;
    }